At One Place

Ounces to milligrams

1 ounce in milligrams
1 oz = 28,349.523 mg
mg = oz × 28,349.52313

To convert ounces to milligrams, multiply by 28,349.52313. The table below gives the values people look up most often, and the converter works for any number.

Ounces to milligrams table

Common ounce values converted to milligrams.
Ounces Milligrams
1 oz 28,349.523
2 oz 56,699.046
3 oz 85,048.569
4 oz 113,398.09
5 oz 141,747.62
10 oz 283,495.23
15 oz 425,242.85
20 oz 566,990.46
25 oz 708,738.08
30 oz 850,485.69
40 oz 1,133,980.9
50 oz 1,417,476.2
75 oz 2,126,214.2
100 oz 2,834,952.3
250 oz 7,087,380.8
500 oz 14,174,762
1,000 oz 28,349,523

How the conversion works

The relationship is mg = oz × 28,349.52313. Both units measure mass, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

Common questions

How many milligrams are in one ounce?
One ounce equals 28,349.523 milligrams. mg = oz × 28,349.52313.
How do you convert ounces to milligrams?
Use mg = oz × 28,349.52313. So 10 oz is 283,495.23 mg.
How many ounces are in one milligram?
One milligram equals 0.00003527 ounces, which is the reverse of the conversion above.

Related pages

Sources

  1. Guide for the Use of the International System of Units (SP 811) — NIST (Public domain (US Government))
  2. The International System of Units (SI Brochure) — Bureau International des Poids et Mesures
  3. Calculated on this page — At One Place

How these figures are compiled and checked